<template>
  <ul class="app-header-nav">
        <li class="home"><RouterLink to="/">首页</RouterLink></li>
        <li  v-for="item in list" :key="item.id" @mouseenter="show(item)" @mouseleave="hide(item)">
          <router-link :to="`/category/${item.id}`" @click="hide(item)">{{item.name}}</router-link>
            <div class="layer" :class="{open:item.open}">
              <ul>
                  <li v-for="sub in item.children" :key="sub.id">

                  <!--@click="hide(item)"这里的参数还是要传递item-->
                  <router-link :to="`/category/sub/${sub.id}`" @click="hide(item)">
                    <img :src="sub.picture" alt="">
                    <p>{{sub.name}}</p>
                  </router-link>
                </li>
              </ul>
           </div>
        </li>
      </ul>
</template>

<script>
import { useStore } from 'vuex'
import { computed } from 'vue'
export default {
  name: 'AppHeaderNav',
  setup () {
    const store = useStore()
    const list = computed(() => store.state.category.list)
    // console.log(list.value)

    // 解决跳转时不会关闭二级分类
    const show = item => store.commit('category/SHOW', item.id)
    const hide = item => store.commit('category/HIDE', item.id)

    return { list, show, hide }
  }
}
</script>

<style lang="less" scoped>
 .app-header-nav {
  width: 820px;
  display: flex;
  justify-content: space-around;
  padding-left: 40px;
  position: relative;
  z-index: 998;
  // "> li" 自己的子级li标签才会具有下面的属性
  > li {
    margin-right: 40px;
    width: 38px;
    text-align: center;
    > a {
      font-size: 16px;
      line-height: 32px;
      height: 32px;
      display: inline-block;
    }
    &:hover {
      > a {
        color: @xtxColor;
        border-bottom: 1px solid @xtxColor;
      }
      // > .layer {
      //   height: 132px;
      //   opacity: 1;
      // }
    }
  }
}
.layer {
  &.open{
    height: 132px;
    opacity: 1;
  }
  width: 1240px;
  background-color: #fff;
  position: absolute;
  left: -200px;
  top: 56px;
  height: 0;
  overflow: hidden;
  opacity: 0;
  box-shadow: 0 0 5px #ccc;
  transition: all .2s .1s;
  ul {
    display: flex;
    flex-wrap: wrap;
    padding: 0 70px;
    align-items: center;
    height: 132px;
    li {
      width: 110px;
      text-align: center;
      img {
        width: 60px;
        height: 60px;
      }
      p {
        padding-top: 10px;
      }
      &:hover {
        p {
          color: @xtxColor;
        }
      }
    }
  }
}
</style>
